I just wrote a post about image theft on Steemit, and I have written a few in the 6 months since I have been on here. It is a sore point with me, as I am a stock photographer! You tube posts appear to be fair game. There is absolutely no policy about copyright infringement. It's up to the community. For that very reason, I will not Upvote any post that is illegally using an image or artwork!